Visualization of structural evolution and phase distribution of a lithium vanadium oxide (Li1.1V3O8) electrode via an operando and in situ energy dispersive X-ray diffraction technique

Physical Chemistry Chemical Physics : PCCP
Qing ZhangAmy C Marschilok

Abstract

Li1+nV3O8 (n = 0-0.2) has been extensively investigated as a cathode material for Li ion batteries because of its superior electrochemical properties including high specific energy and good rate capability. In this paper, a synchrotron based energy dispersive X-ray diffraction (EDXRD) technique was employed to profile the phase transitions and the spatial phase distribution of a Li1.1V3O8 electrode during electrochemical (de)lithiation in situ and operando. As annealing temperature during the preparation of the Li1.1V3O8 material has a strong influence on the morphology and crystallinity, and consequently influences the electrochemical outcomes of the material, Li1.1V3O8 materials prepared at two different temperatures, 500 and 300 °C (LVO500 and LVO300), were employed in this study. The EDXRD spectra of LVO500 and LVO300 cells pre-discharged at C/18, C/40 and C/150 were recorded in situ, and phase localization and relative intensity of the peaks were compared. For cells discharged at the C/18 rate, although α and β phases were distributed uniformly within the LVO500 electrode, they were localized on two sides of the LVO300 electrode. Discharging rates of C/40 and C/150 led to homogeneous β phase formation in both LVO500 and LV...Continue Reading

References

Feb 18, 2010·Chemistry of Materials : a Publication of the American Chemical Society·Esther S TakeuchiKenneth J Takeuchi
Aug 21, 2013·ACS Applied Materials & Interfaces·Shuquan LiangAnqiang Pan
May 23, 2014·ACS Applied Materials & Interfaces·Yang YangJames M Tour
Apr 2, 2015·Physical Chemistry Chemical Physics : PCCP·Kevin C KirshenbaumEsther S Takeuchi
Jul 1, 2016·Physical Chemistry Chemical Physics : PCCP·Alexander J PearseGary W Rubloff
Oct 28, 2016·Physical Chemistry Chemical Physics : PCCP·Eleanor I GilletteSang Bok Lee

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